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DOI: 10.1055/s-0042-1751544
Stereochemical Aspects of the C-Glycosylation of Pyranosides and Furanosides
Abstract
The stereoselective synthesis of α- and β-C-glycosides is one of the most challenging areas of research in the field of glycoside chemistry. In this review, we summarize the various methods available for stereocontrolled glycosylation and also discuss the predictive models available to explain the stereochemical outcome of six- and five-membered-ring oxocarbenium ions with allyltrimethylsilane nucleophile under Lewis acid conditions.
1 Introduction
2 Stereochemical Aspects during Glycoside Bond Formation in Pyranosides
2.1 Lewis Acid Mediated Nucleophilic Addition to Six-Membered-Ring Oxocarbenium Ions
2.2 Arylalane Addition to Anhydroglucose
2.3 Glucal Epoxide Method
2.4 Glycosyl Leaving Group Substitution Method
2.5 Glycosylation via Transition-Metal-Mediated Cross-Coupling
3 Stereochemical Aspects during Glycoside Bond Formation in Furanosides
3.1 Lewis Acid Mediated Nucleophilic Addition to Five-Membered-Ring Oxocarbenium Ions
4 Summary and Conclusion
Key words
C-glycosylation - stereoelectronic control - transition state - oxocarbenium ion - pyranosides - furanosidesPublication History
Received: 01 October 2023
Accepted after revision: 01 December 2023
Article published online:
26 February 2024
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Selected references:
Selected references:
Selected references for N-glycosides:
Selected references for C-glycosides:
Selected references for the construction of C-glycoside bond:
Experimental studies:
Theoretical studies:
Additional examples for β-selectivity:
Via intramolecular migration of arylsiloxanes:
Via cuprates:
With soft nucleophiles:
Via Grignard reagents:
Via organozinc reagents:
Via organotrifluoroborates:
O- to C-Glycoside rearrangement:
Selected references for the Hiyama–Denmark coupling reaction:
Selected references for the Heck coupling reaction:
Selected references for the Stille coupling reaction:
Selected references for the Suzuki–Miyaura coupling reaction:
Selected references for the Negishi coupling reaction:
Other reactions of acetals do not appear to involve free cations: